Change slurm exporter to Slinky slurm exporter

[mhuguesaws]

Schedmd release slurm exporter support in Slinky project https://github.com/SlinkyProject/slurm-exporter

[nghtm]

The Makefile currently references a helm resource here, which causes failure to build on Slurm controller node. If Helm is a dependency for this project, it still needs to be evaulated as to whether this project is suitable to be installed on a Slurm Controller Node

[mhuguesaws]

One can use make run to run on the localhost. You will need to make sure you have slurm REST API install
You can do so by running https://github.com/aws-samples/aws-parallelcluster-post-install-scripts/blob/main/rest-api/postinstall.sh to install and configure Slurm restd.

Once done, get a token export METRICS_TOKEN=scontrol token | cut -d '=' -f 2
Then run the exporter make run or go run ./cmd/main.go